Now, to the new details breaking on the ferry disaster in South Korea. We're learning that the ship may not have taken a hard turn in its final minutes. That's raising a lot of new questions. ABC's Gloria Riviera is on that story for us this morning. Reporter: Robin, there is new information this morning indicating the ship may have been traveling at its top speed, through that difficult area. The captain and members of his crew remain in custody, with the clock ticking. Prosecutors have just 36 hours left to decide whether or not to formally arrest six other members of the crew detained in this investigation, which is focusing on what went so horribly wrong. This morning, new details adding to the mystery and confusion surrounding the tragedy. One south Korean official telling A.P., it's wrong to say the ship made a sharp turn, causing the extreme tilt. Trapping passengers at such an angle they could not move. Data from a transponder on the seawall, only now fully compiled almost a week after the ferry sank, shows the true path to be less severe. What's described as a "J" turn. The ship was in a tricky waterway. The inexperienced third mate, navigating for the first time. We were on-site where the ferry sank yesterday. This is where the search and rescue operation looks like on the ocean. There are cranes. There are helicopters. More boats than I can count. All here, part of this effort. Divers with, perhaps, the toughest job of all. Today, the death toll spiking past 100. The number of missing, falling below 200. This father, one of the lucky ones. His child, a survivor. Had a plea to the government. Please understand the anguished hearts of parents, he said, who want to go into the water to search for their trapped children themselves. One south Korean diver telling reporters, the conditions inside the submerged ship are so awful, they can't bare to face the families. Robin? Gloria, thank you.

This transcript has been automatically generated and may not be 100% accurate.

South Korean Ferry Disaster: The Calls for Help

Chilling radio calls of panic as ferry went down and confusion over evacuation orders.

Dramatic Ferry Rescue Video Puts You in the Water

Passengers are seen clinging to the sinking ferry and being pulled from waters off the coast of South Korea.

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